Utilitech 13 Watt CFL Spiral Fluorescent Light Bulb, 60 Watt Equivalent, Soft White (6 Pack) 10,000-hour liftetime - saves approximately $52.00 USD over lifetime of one bulb 900 Lumens per bulb Estimated $1.57 annual energy cost per bulb 2700K, Soft White For optimum longevity, most compact fluorescent lights function best when not placed upside down in a ceiling fan ceiling fans.